Arc-welding apparatus



Sept.. 18,3923 'Lfwsg J. A. HOLJFEEL ARC WELDING APPARATUS Original Filed May 9 1921 ENVENTOR JAHeli'field.

ATTORNEY fil ntentcd dept, lh/mt.,

fsm u' @mL-"MTG @@RWMTION, F

NEW YORK, lil. Y., .el CORPORATION 0F 1t EW YORK.

AEG-'WELDING APPRT'S.

digplictiem ille@ my il, will, Serial Hb. llld. Renewed dune 39, 1923.

`new and useful improvements in fire- Welding Apparatus, oi which the following isn speciiicstion.

This invention relates to enero welding apparatus, and hns `for its object to modify and improve for certein uses .the twin field type of seli-regulatin generator for crc Welding circuits whic forms the subject metterci my pending application, Serial No. -fl5d,277, filed the 21st dey of Merch, 1921, wherein 'I have described und claimed e nerato comprising e single 4armature un commutator with twin independent sets ofelds, one set seperately excited by n substantially constant potential l). C. current, and other set differentially excited 'hy o. serie.:1 current from 'the generator itself, the constantly excited' fields being Wound to exert u predominating magnetic inuence on the amature which is opposed more or less according to the resistance in the crc by the magnetic influence of opposite polarity of the series fields. The result is that t e sum of the magnetic in- :duence of the twin iields is to generate or induce s current How which, within the normail elustic limits oi the orc will utomutically-maintain e substantially constant cur- `.rent of Wattage inthe crc.

ln my present invention l contemplate the use of tvvin fields excited es above described, and in addition thereto l provide in the series wound set of variablyexcited fields a reversing windin so connected that under open circuit con ition it bucks the series windings und under Workin conditions it boosts the series windings ci the vuriubly excited set of' fields. The advantage of this arrangement is thet it makes the regulating function oit the generating apparatus more As illustrative of my invention, ll have shown dia-gremmeticelly in the accompanying drawings which torni c part ci this specification, e typical twin field generating end self regulating src welding apparatus in which 1 is n shaft driven by snysuitable source of power and having mounted thereon an armature 2 which is elongated to permit its co-aqtion with the twin sets of fields .3 und fl which are independent of each other and disposed to exert their joint magneticI inliucnce et the'sarnc time upon the sume coil of the armature windings, which is typicully illustrated at 5. rlhe armature core is preferably designed with a gap 6 hetweentlic independent sets or poles, which is referelole hut not essentiel.

urrent from enysubstantially constant potentiel D. C. source is supplied by u, conductor 7 to the iield windings 3 surrounding the poles 8 ofthe constantly excited set ot j ields, the current returning over conductor 9. The generator has any standard type' of commutetor 10 connected in any normal manner with the armature windings 5 und has its brushes l1 connected in series with the crc circuit 12, which includes in series therein the manually controllable electrodes 13 und let und the iicld windings 4f surrounding the poles 15 ci' the other orgvcricbly-encited 'set 0i lields. oi fields 3 and i are so wound nslto produce, under operating conditions, opposed olerity und they should be so Wound an proportioned es to ceuse e predetermined flow.

of current through the -ero circuit 12 when in service. By n brunch circuit 16 l divert current from the conductor 7 through o. re sistence 17 to the junction point 18 which is connected by u circuit 19 with one side of the orc circuit 12. From the junction 18 e circuit 20, having therein a resistance 2l, is connected to ,e junction point 22 where one branch 23 connects to the conductor 9 and' the other branch is connected through windings 24 on the poles 15 of the fields 4 to u circuit 25 which in turn is connected to the 'opposite side of the crc circuit 12 from.

circuit 19.

ln operation, with the crc circuit open, no appreciable current will dow through the ield windings d, but current will dow collectively from the exciting circuit 7 by circuit 16 past resistance 17,and from the generator through circuit 19 to the junction point 18 and thence over circuit 20 pest resistance to the junction point 22 where it will branch, port returning through circuit 28 to conductor 9 and part flowing through the field `windings 2i so as to megnctize the cores l5 of the vsriahly excited set oi' fields e with the same polarity as the cores 8,'end thereupon the two iields will exert the sum of their magnetic influence collectively on The twin -parallel sets thewindings of the armature and will increase the/,voltage of the machine. 1Uzpen striking the nrc, current inmediately flows through the-ields and, there being less resistencc in the a'rc circuit than in the circuit 19, 20, thisjcurrent will practically all How through the are circuit and thereupon the current flowing through circuit te will also flow fromjunction- 18 over wire 19 instead of 20 and thus the two currents will flow collectively through the arc circuit 1 to the junction point 26 where theericiting cir-- cuitr will branch, returning over circuit in a reverse direction through field windings 24 to the junction point 22 and thence by circuit 23 to conductor 9. When this occurs the polarity of the windings 24 is reversed and they will boost the action of the Windings 4, which lowers the armature volte e by decreasin the predominance of the coi s 3. The resu t is to produce c. substantiel@ constant current or wnttcge et the are.

Having thus described my invention, 'what I claim as new and desire to secure by Letters Patent, is

1. An arc Welding apparatus comprising twin fields of opposite clarity when the :irc is struck, one seperate y excited end one :i series wound held responsive to the current flow at the are, efcommutctor in series with said latter field, ein nrrneture having its windings jointly and simultaneously inn luenced by scid twin ields, armature brushes, e reversing winding in the series field, and circuit connections to reverse the current iow lfithrough snicl reversing Wintiing to cii'use it to beest the' series winding; when the arc is struck.

2. An arc welding apparatus comprising twin fields of opposite polarity when the nrc is struck, one seperately excite and one e series wound iield responsive to the current flow at the arc, e commuter/or in series with said latter field, sn armature hei/ing ite windings jointly and simultaneously in- License current tlow through seid reversing winding to cause it to boost the series winding when the arc 1s struck, said series and reversinglwindings being both responsive to the variable resistance et the nrc.

3. An arc welding apparatus comprising twin fields of opposite polarity when the arc is struck, one seperately excited und one a series wound field .responsive to the current iiow et the are, n ccrnmutetor in series with seid latter field, an armature having its windings jointly sind simultaneously iniluencecl by seid twin fields, armature connections to reverse the current iow through seid reversing, winding to cause it to boost the series winding when the arc is struck, seid series and reversing windings being both1 responsive to the variable resistance et the nrc, enti seid reversing winding being connected in parallel with the separately excited field :incl across the welding armature brushes.

ai. In en arc welding apparatus, an armcture having e .single commutator and brushes, an nrcl circuit in series with the brushes, twin sets of fielels for seid armature, :i circuit for seperately exciting one set of fields, a series winding for oppositely exciting the other set otfielcls, a, reversing winding in the series fields, a parallel circuit branched from thc sepurateexciting circuit and having therein n resistance, si branch circuit connecting scid ucrailcl circuit with one side oic the ere circuit, und n branch circuit connecting the other side of the arc circuit te scid pnrcllel circuit and having inclniiefl in seines therein the said reversing winoiing.

in tcstirnon whereof i @hlx mi; signature. USEPH HLFELD.

, Witness:

Nonni Wenen. 

